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2007 International Conference on Electromagnetics in Advanced Applications最新文献

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Particle Swarm Optimization (PSO) in Engineering Electromagnetics: A Nature-Inspired Evolutionary Algorithm 工程电磁学中的粒子群优化:一种受自然启发的进化算法
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387266
Y. Rahmat-Sami, N. Jin
{"title":"Particle Swarm Optimization (PSO) in Engineering Electromagnetics: A Nature-Inspired Evolutionary Algorithm","authors":"Y. Rahmat-Sami, N. Jin","doi":"10.1109/ICEAA.2007.4387266","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387266","url":null,"abstract":"This paper presents representative electromagnetic engineering applications of a particle swarm optimization (PSO) engine developed at UCLA antenna lab. The paper provides a conceptual overview of the PSO engine that accommodates real-number, binary, single-objective and multi-objective optimizations, along with five examples illustrated to validate the algorithm's functionality in a large variety of practical problems. Examples include the design of dual/multi-band patch antennas, aperiodic antenna arrays, periodic structures, correlator antenna arrays, etc. In most cases the designs provided by PSO are prototyped, with high-quality performance observed from the measurement results.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128779102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Antenna Arrays and Propagation Models for Advanced Wireless Systems 先进无线系统的天线阵列和传播模型
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387243
M. Iskander, Z. Yun, N. Celik, J. Bell, W. Kim
{"title":"Antenna Arrays and Propagation Models for Advanced Wireless Systems","authors":"M. Iskander, Z. Yun, N. Celik, J. Bell, W. Kim","doi":"10.1109/ICEAA.2007.4387243","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387243","url":null,"abstract":"The development of advanced phased array antennas and new propagation models that address wireless applications in challenging propagation environments have and will continue to be a critically important component in the development of future wireless systems with applications in communications, radar, and Satellite technologies. In spite of the significant advances in these technologies, challenges continue to preclude their low cost, reliable, and high speed application in tough propagation environments including urban areas, UAVs, and other DoD applications. In this paper we describe some of the ongoing research activities at the University of Hawaii in the area of advanced wireless systems. In the antenna array design technology, two complementary antenna arrays designs will be described and the development of an ultra-wideband ground plane for foliage penetrating radars will be discussed. For the propagation modeling area, new models for characterizing indoor/outdoor transmission and for evaluating wireless coverage in urban areas taking into account the radiation patterns of the transmitting and receiving antennas will be presented. In all cases simulation results will be presented and validation with experimental observations will be included whenever available.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129099259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A Gaussian beam shooting scheme for fast multidimensional physical simulation of propagation channels in wireless communication systems 一种用于无线通信系统中传播信道快速多维物理仿真的高斯射束方案
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387231
C. Letrou
{"title":"A Gaussian beam shooting scheme for fast multidimensional physical simulation of propagation channels in wireless communication systems","authors":"C. Letrou","doi":"10.1109/ICEAA.2007.4387231","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387231","url":null,"abstract":"This paper illustrates the ability of Gaussian beam shooting techniques to accommodate large propagation problems in multipath contexts. Frame based decomposition of fields provides a flexible and efficient tool to perform beam launching. Channel transfer matrices are defined, which allow for a complete description of multidimensional channels through a limited number of coefficients. A beam re-expansion algorithm is proposed to address the problems of beam widening, and diffraction by objects with limited extension, through the conjoint use of wide/narrow frame windows.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116944465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Advances in the Planning and Control of the MR-guided Regional Hyperthermia Applications 核磁共振引导局部热疗应用的规划与控制研究进展
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387478
J. Nadobny, M. Weihrauch, M. Weiser, J. Gellermann, W. Wlodarczyk, V. Budach, P. Wust
{"title":"Advances in the Planning and Control of the MR-guided Regional Hyperthermia Applications","authors":"J. Nadobny, M. Weihrauch, M. Weiser, J. Gellermann, W. Wlodarczyk, V. Budach, P. Wust","doi":"10.1109/ICEAA.2007.4387478","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387478","url":null,"abstract":"A novel method for improved planning and control of the magnetic resonance (MR)-guided hyperthermia (HT) has been developed and tested in the combined Berlin MR-HT hybrid system, consisting of the 12-channel HT applicator Sigma-Eye and of the MR tomograph Siemens MAGNETOM Symphony 1.5 T. The method is based on a step-by-step adaptation of antenna profiles (single antenna fields) using MR temperature rise measurements obtained by the proton resonance frequency shift (PRFS) method. A Gauss-Newton algorithm is applied as an iterative solver for adaptation. It is shown that, using the finite-difference time-domain (FDTD) method as initial estimate for antenna profiles, already after few adaptation steps a significant improvement of the specific absorption rate (SAR) predictability in the MR-HT hybrid system is reached.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115701480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TLM Modeling and System Identification of Distributed Microwave Circuits and Antennas 分布式微波电路与天线的TLM建模与系统辨识
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387310
U. Siart, K. Fichtner, Y. Kuznetsov, A. Baev, P. Russer
{"title":"TLM Modeling and System Identification of Distributed Microwave Circuits and Antennas","authors":"U. Siart, K. Fichtner, Y. Kuznetsov, A. Baev, P. Russer","doi":"10.1109/ICEAA.2007.4387310","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387310","url":null,"abstract":"In this paper we present the time domain computation of the impulse response of optimized antenna structures using the transmission line matrix TLM method. Hybrid extensions based on system identification (SI) are a means to reduce the computational burden considerably. Model-based SI procedures can be used to represent complex electromagnetic structures by means of both lumped element networks and distributed parameters models.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115191229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A synthetic function approach to the scattering from large objects by using incremental diffraction-type basis functions 用增量衍射型基函数研究大物体散射的综合函数方法
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387364
M. Casaletti, S. Maci, G. Vecchi
{"title":"A synthetic function approach to the scattering from large objects by using incremental diffraction-type basis functions","authors":"M. Casaletti, S. Maci, G. Vecchi","doi":"10.1109/ICEAA.2007.4387364","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387364","url":null,"abstract":"This paper presents an innovative procedure that allow the full-wave analysis of electrically large/or complex objects at a reduced memory cost. The conventional MoM formulations are severely limited by the problem size, because it leads to large, dense and sometimes ill-conditioned matrices, with a consequent huge memory occupation and CPU time. Within the iteration-free method we propose here a method to treat large portion of perfectly metallic planar objects containing edges introducing a special type of basis functions.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115812679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Assessment of Electromagnetic Requirements for UWB Through-Wall Radar 超宽带通壁雷达电磁需求评估
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387455
X. Zhuge, T. Savelyev, A. Yarovoy
{"title":"Assessment of Electromagnetic Requirements for UWB Through-Wall Radar","authors":"X. Zhuge, T. Savelyev, A. Yarovoy","doi":"10.1109/ICEAA.2007.4387455","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387455","url":null,"abstract":"This paper investigates electromagnetic requirements for ultra-wideband (UWB) through-wall radar. It includes the evaluation of propagation loss, dynamic range and radar resolution for typical through-wall scenarios. The evaluation results in analysis and comparison of different transmission schemes.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116170675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Finite element methods with stable hybrid explicit-implicit time-integration schemes 稳定显隐混合时间积分格式的有限元方法
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387318
T. Rylander
{"title":"Finite element methods with stable hybrid explicit-implicit time-integration schemes","authors":"T. Rylander","doi":"10.1109/ICEAA.2007.4387318","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387318","url":null,"abstract":"Finite element methods with stable hybrid explicit-implicit time-integration schemes are reviewed. In particular, constructions that reduce to the well-known finite-difference time-domain (FDTD) scheme on structured grids of cubes are considered. Unstructured tetrahedrons with implicit time-stepping are used in the vicinity of curved and complex boundaries. The tetrahedrons are connected to the FDTD cells either directly or by means of a layer of pyramids. The hybrid methods show second order convergence (when the field solution is regular) with respect to cell size, preserve the null-space of the curl-operator, do not suffer from spectral contamination, and provide stable-time stepping up to the Courant condition of the FDTD scheme without artificial damping.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114424061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Micromagnetic Simulation of Switching Mechanism in Permalloy Square Rings 坡莫合金方环开关机理的微磁仿真
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387377
L. Fumagalli, A. Žohar, V. Metlushko
{"title":"Micromagnetic Simulation of Switching Mechanism in Permalloy Square Rings","authors":"L. Fumagalli, A. Žohar, V. Metlushko","doi":"10.1109/ICEAA.2007.4387377","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387377","url":null,"abstract":"We demonstrate how the micro magnetic simulations could reproduce the experimentally found onion, horseshoe, and vortex configurations in square ring nano-magnets for different field orientations. Then we discuss an existence of a less known intermediate state which consists of two domain walls along one side of the square ring and how the annihilation of those two domain walls leads to the formation of a vortex state for the external field applied parallel to the square rings. Finally we compare our simulations with results of Lorentz Microscopy. Reliable simulation is the key for the implementation of magnetic square rings as memory elements and inputs for magnetic logic gates.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127169178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Explicit Stability Conditions for FDTD on Nonuniform Tensor-Product Grids 非均匀张量积网格上FDTD的显式稳定性条件
2007 International Conference on Electromagnetics in Advanced Applications Pub Date : 2007-11-21 DOI: 10.1109/ICEAA.2007.4387315
R. Remis
{"title":"Explicit Stability Conditions for FDTD on Nonuniform Tensor-Product Grids","authors":"R. Remis","doi":"10.1109/ICEAA.2007.4387315","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387315","url":null,"abstract":"In this paper we present sufficient conditions for stability of the finite-difference time-domain method on nonuniform tensor-product grids. The general Courant-Friedrichs-Lewy stability condition can be written in terms of the spectral radius of the first-order Maxwell system matrix. In this paper we present upper bounds for this spectral radius and we use these bounds to obtain sufficient conditions for stability of FDTD in one, two, and three dimensions. The stability conditions are all presented in terms of the maximum electromagnetic wave speed present in the configuration and the minimum step sizes of the grid. Moreover, our conditions reduce to the well-known stability conditions for FDTD if the grid is uniform.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127329232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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